MagicStack/uvloop

Health v2 · maintenance only

Adoption not part of the score

11886 stars · 612 forks observed · 2026-08-28

What it is AI-extracted, prompt v1, taxonomy v1, 2026-08-29, confidence not recorded

uvloop is a fast, drop-in replacement for the built-in asyncio event loop, implemented in Cython on top of libuv. It makes asyncio-based Python networking 2-4x faster with a simple API (uvloop.run()).

Use cases

• speed up asyncio networking in python
• drop-in replacement for asyncio event loop
• make python web server faster
• high performance async python
• replace default event loop with libuv-based one
• boost asyncio throughput for echo servers and proxies

When to choose

• you run asyncio-based network services on Linux or macOS and want 2-4x better performance
• you want a drop-in event loop replacement with minimal code changes
• you build high-throughput servers, proxies, or clients on asyncio

When to avoid

• you target Windows, where uvloop is not supported
• your workload is not I/O-bound and won't benefit from a faster event loop
• you need maximum portability with only the standard library

Facets

library · maturity stable

concurrency networking http-server developer-tools backend performance web-development python cross-platform asyncio event-loop libuv cython high-performance linux macos

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